High-performance electromagnetic wave absorbers based on hierarchically porous (Zn1/2Ni1/2)Co2O4 spinel clusters

The development of lightweight electromagnetic wave absorbers with strong absorption performance, and broad absorption bands has garnered significant attention toward electromagnetic protection. In this study, 3D hierarchically porous (Zn1/2Ni1/2)Co2O4 spinel clusters were synthesized via a straightforward hydrothermal reaction followed by calcination. Notably, the (Zn1/2Ni1/2)Co2O4 spinel calcined at 500 ℃, the hierarchically porous (Zn1/2Ni1/2)Co2O4 spinel clusters achieved the minimum reflection loss value and effective absorption band of -66.6dB and 6.45GHz at a matching thickness of 2.47mm and 2.35mm, respectively. These outcomes were due to the synergistic effects induced by dielectric loss, magnetic loss, and the unique hierarchical porous structure of the prepared spinel. Our findings will promote the development of electromagnetic protection technologies and inspire the design and fabrication of high-performance electromagnetic wave absorbing materials.